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Well, I have tested a bit more and it seems that the sensor is the problem. Because when I make a call the screen goes black aswell. Strange that this came right after bella upgrade.. Guess I'l have to hand it in to Nokia.

Hi, yes I tried without luck. i found an other thread on the same problem aswell. I have handed it into service now. And I bought myself a new one.. To always have one working unit ;-) Even though I got a Sensation XE with ice cream sandwich.. the nokia seems much better for the real work!

As the user has stated, it's working perfectly, i'm looking at the screen and its perfectly clear, but if i have an incoming call i see the screen going black until call ends, in wich moment the screen turns on again.